BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Matthew Reece (Harvard U.) DTSTART:20200525T140000Z DTEND:20200525T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/1 DESCRIPTION:Title: A Swampland Tour: From Global Symmetries to Axion Physics\nby Matthew R eece (Harvard U.) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe Swampl and program aims to distinguish effective quantum field theories that can potentially arise within UV-complete quantum gravity theories (“the Land scape”) from those that cannot (“the Swampland”). The most well-esta blished such criterion is that theories of quantum gravity never have exac t global symmetries. I will discuss some generalizations and consequences of this idea. In particular\, I will discuss work in progress (with Heiden reich\, McNamara\, Montero\, Rudelius\, and Valenzuela) on how axion field s often play a crucial role in banishing global symmetries from a theory\, with potential phenomenological implications.\n\nsend email to iftweb101 @gmail.com for zoom link\n LOCATION:https://researchseminars.org/talk/IFTWeb/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Giuseppe Fanizza (I. Astrofisica\, Lisbon) DTSTART:20200528T140000Z DTEND:20200528T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/2 DESCRIPTION:Title: A veraging cosmological observables in the LSS surveys\nby Giuseppe Fani zza (I. Astrofisica\, Lisbon) as part of IFT-Madrid Webinars\n\n\nAbstract \nIn this talk I will discuss a systematic and rigorous classification of all the possible choices for averaging observables in cosmology. In this r egard\, the use of the so-called Geodesic Light-con gauge provides simple expressions as I will show here. These new results will be compared with t he recent literature. Moreover\, I will discuss their impact on the bias t hat they can induce in the estimation of statistical properties\, such as mean value and dispersion. Finally\, the connection between all the presen ted theoretical prescriptions\, the observations and the numerical simulat ions for the case of the luminosity distance will be discussed.\n\nsend em ail to iftweb101@gmail.com to get zoom link\n LOCATION:https://researchseminars.org/talk/IFTWeb/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Pablo Bueno (Centro Atomico Bariloche (Argentina)) DTSTART:20200611T140000Z DTEND:20200611T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/3 DESCRIPTION:Title: R eflected entropy\, symmetries and free fermions\nby Pablo Bueno (Centr o Atomico Bariloche (Argentina)) as part of IFT-Madrid Webinars\n\n\nAbstr act\nEntanglement entropy (EE) is an intrinsically divergent quantity in q uantum field theory (QFT). Recently\, a well-defined notion of von Neumann entropy associated to pairs of spatial subregions has been proposed both in the holographic context — where it has been argued to be related to t he entanglement wedge cross section — and for general QFTs. I will show that\, similarly to the EE\, the reflected entropy for Gaussian fermion sy stems can be simply obtained in terms of correlation functions and I will explicitly evaluate it numerically for two intervals in the case of a two- dimensional Dirac field. Then\, I will argue that the definition of this “reflected entropy” can be canonically generalized in a way which is p articularly suitable for orbifold theories — those obtained by restricti ng the full algebra of operators to those which are neutral under a global symmetry group. I will evaluate explicitly this new "type-I entropy” fo r the $\\mathbb{Z}_2$ bosonic subalgebra of the Dirac field. A key role in the construction is played by type-I von Neumann algebras\, which differ from the usual type-III algebras associated to spatial regions in QFT. Usi ng the free-fermions case\, I will perform very explicit comparisons betwe en both types of algebras.\n\nEmail iftweb101@gmail.com to get zoom link \n LOCATION:https://researchseminars.org/talk/IFTWeb/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Alexander Lenz (U. Durham (UK)) DTSTART:20200615T140000Z DTEND:20200615T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/4 DESCRIPTION:Title: P er aspera ad astra: Impact of high precision standard model predictions fo r new physics searches\nby Alexander Lenz (U. Durham (UK)) as part of IFT-Madrid Webinars\n\n\nAbstract\nWe review recent progress in increasing the precision of SM flavour observables\, like heavy hadron lifetimes or B-mixing. The latter observable turns out to be a severe constraint on BSM models that try to explain the recently observed anomalies in the flavour sector.\n\nEmail iftweb101@gmail.com to get zoom link\n LOCATION:https://researchseminars.org/talk/IFTWeb/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Maria Ubiali (DAMTP (Cambridge\, UK)) DTSTART:20200629T140000Z DTEND:20200629T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/5 DESCRIPTION:Title: C an New Physics hide in the proton PDFs?\nby Maria Ubiali (DAMTP (Cambr idge\, UK)) as part of IFT-Madrid Webinars\n\n\nAbstract\nA major recent b reakthrough in global fits of the structure of the proton has been the inc lusion of a significant amount of precise LHC measurements. While this dat a provides important constraints\, especially on the poorly-know gluon and anti-quark PDFs\, it is crucial to avoid any contamination from potential beyond the Standard Model (BSM) effects that could be present in the high energy or transverse momentum tails of the fitted experimental distributi ons. This problem is particularly acute for LHC data from Runs II and III\ , as well as for the future High-Luminosity Run\, where many PDF-sensitive observables will reach the few TeV region. In this talk\, I present a fir st quantitative study aiming to study whether or not New Physics effects c an be reabsorbed into the fitted PDFs\, as well as the possibility of sett ing up a global QCD fit to simultaneously constrain the proton structure a nd New Physics dynamics.\n\nTo get zoom link\, write to iftweb101@gmail.co m\n LOCATION:https://researchseminars.org/talk/IFTWeb/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Seyda Ipek (U.C. Irvine) DTSTART:20200706T150000Z DTEND:20200706T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/6 DESCRIPTION:Title: A Model of Neutrino Masses and the LHC\nby Seyda Ipek (U.C. Irvine) as part of IFT-Madrid Webinars\n\n\nAbstract\nNeutrino masses cannot be expla ined within the Standard Model. Many new physics models address this quest ion by adding right-handed neutrinos to the SM. These right-handed neutrin os are generally not expected to be observed at the LHC due either to thei r large masses or small couplings to the SM particles. I will give a diffe rent approach\, in which we account for the SM neutrino masses via a pesud o-Dirac bino in an R-symmetric SUSY model. This model can be probed by LHC jets+MET and leptoquarks searches. I will also talk about our ongoing wor k to look for a long-lived pseudo-Dirac bino at the LHC.\n\nTo get Zoom li nk send email to iftweb101@gmail.com\n LOCATION:https://researchseminars.org/talk/IFTWeb/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Akash Jain (U. of Victoria (Can)) DTSTART:20200928T140000Z DTEND:20200928T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/7 DESCRIPTION:Title: N on-universality of Hydrodynamics\nby Akash Jain (U. of Victoria (Can)) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe late-time long-distance behaviour of a many-body system is usually described by the framework of hydrodynamics or similar condensed matter models based on the (possibly sp ontaneously broken) symmetries that the system enjoys. These models are ch aracterised by a set of transport coefficients\, such as viscosities and c onductivity\, that capture the transport properties of conserved charges o ver macroscopic scales. In this talk\, we will investigate a new kind of t ransport coefficients that are not present in the usual formulation of hyd rodynamics\, but nonetheless affect the late time dynamics of conserved ch arges. Physically\, these new coefficients arise due to the interaction of the hydrodynamic degrees of freedom with the background bath of thermal n oise present out of equilibrium. For the purposes of this investigation\, I will spend some time to review the newly developed Schwinger-Keldysh eff ective action formulation of non-equilibrium field theories\, which allows one to systematically keep track of thermal noise and their correlations. The talk will be based on the recent preprint https://arxiv.org/abs/2009. 01356.\n LOCATION:https://researchseminars.org/talk/IFTWeb/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Sebastian Cespedes (IFT) DTSTART:20201008T140000Z DTEND:20201008T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/9 DESCRIPTION:Title: O n the time evolution of cosmological correlation functions\nby Sebasti an Cespedes (IFT) as part of IFT-Madrid Webinars\n\n\nAbstract\nDeveloping our understanding of how correlations evolve during inflation is crucial if we are to extract information about the early Universe from our late-ti me observables. To that end\, we’ll revisit the time evolution of scalar field correlators on de Sitter spacetime in the Schrodinger picture. By d irect manipulation of the Schrodinger equation\, it is possible to write down simple “equations of motion” for the coefficients which determine the wavefunction. Rather than specify a particular interaction Hamiltonia n\, we assume only very basic properties (unitarity\, de Sitter invariance and locality) to derive general consequences for the wavefunction’s evo lution. In particular\, we identify a number of “constants of motion”: properties of the initial state which are conserved by any unitary dynami cs. We further constrain the time evolution by deriving constraints from t he de Sitter isometries and show that these reduce to the familiar conform al Ward identities at late times. Finally\, we show how the evolution of a state from the conformal boundary into the bulk can be described via a nu mber of “transfer functions” which are analytic outside the horizon fo r any local interaction. These objects exhibit divergences for particular values of the scalar mass\, and we show how such divergences can be remove d by a renormalisation of the boundary wavefunction—this is equivalent t o performing a “Boundary Operator Expansion” which expresses the bulk operators in terms of regulated boundary operators. Altogether\, this impr oved understanding of the wavefunction in the bulk of de Sitter complement s recent advances from a purely boundary perspective\, and reveals new str ucture in cosmological correlators.\n LOCATION:https://researchseminars.org/talk/IFTWeb/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Simon Catterall (Syracuse U.) DTSTART:20201019T140000Z DTEND:20201019T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/10 DESCRIPTION:Title: N=4 Super Yang Mills on the Lattice\nby Simon Catterall (Syracuse U.) as part of IFT-Madrid Webinars\n\n\nAbstract\nI will show how N=4 SYM can be discretized on a lattice while preserving some supersymmetry. Recent im provements to the lattice action now allow simulations for arbitrarily str ong 't Hooft coupling $\\lambda$. I will show some preliminary results for supersymmetric Wilson loops which clearly show the absence of confinement and the $\\sqrt{\\lambda}$ dependence at strong coupling expected from ho lography.\n LOCATION:https://researchseminars.org/talk/IFTWeb/10/ END:VEVENT BEGIN:VEVENT SUMMARY:Juan S. Cruz (Munich Tech. U.) DTSTART:20201022T140000Z DTEND:20201022T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/11 DESCRIPTION:Title: Gradient effects on false vacuum decay in gauge theory\nby Juan S. Cru z (Munich Tech. U.) as part of IFT-Madrid Webinars\n\n\nAbstract\nWe study false vacuum decay for a gauged complex scalar field in a polynomial pote ntial with nearly degenerate minima. Radiative corrections to the profile of the nucleated bubble as well as the full decay rate are computed in the planar thin-wall approximation using the effective action. This allows to account for the inhomogeneity of the bounce background and the radiative corrections in a self-consistent manner. In contrast to scalar or fermion loops\, for gauge fields one must deal with a coupled system that mixes th e Goldstone boson and the gauge fields\, which considerably complicates th e numerical calculation of Green's functions. In addition to the renormali zation of couplings\, we employ a covariant gradient expansion in order to systematically construct the counterterm for the wave-function renormaliz ation. The result for the full decay rate however does not rely on such an expansion and accounts for all gradient corrections at the chosen truncat ion of the loop expansion. The ensuing gradient effects are shown to be of the same order of magnitude as non-derivative one-loop corrections.\n LOCATION:https://researchseminars.org/talk/IFTWeb/11/ END:VEVENT BEGIN:VEVENT SUMMARY:Matteo Baggioli (IFT) DTSTART:20201029T150000Z DTEND:20201029T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/12 DESCRIPTION:Title: Classifying and Understanding Phases of Matter with Effective Theories \nby Matteo Baggioli (IFT) as part of IFT-Madrid Webinars\n\n\nAbstract\nE verything should be made as simple as possible\, but not simpler. This \n classic Einstein's quote summarizes beautifully the spirit of effective \n field theories (EFTs)\, where the measure of simplicity is dictated by the\n symmetries of the system. In this talk\, I will promote the ro le and the\n power of EFT methods by discussing with you some interesti ng open questions\n such as the difference between liquids and solids\, the nature of glassy \n materials and the role of periodicity in cryst als. I will guide you through\n the different theoretical layers\, from standard EFT and hydrodynamics to\n holographic techniques\, emphasizi ng the leading role of spacetime\n symmetries and the wide range of app licability of these methods.\n The talk is designed in a colloquium for mat suitable for all IFT members from\n the 1st to 5th floor and it wil l be my farewell to IFT after these 2 productive\n years.\n LOCATION:https://researchseminars.org/talk/IFTWeb/12/ END:VEVENT BEGIN:VEVENT SUMMARY:Anson Hook (U. Maryland) DTSTART:20201026T150000Z DTEND:20201026T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/13 DESCRIPTION:Title: Aharonov-Bohm in the Sky : A CMB Millikan Experiment with Cosmic Axiverse Strings\nby Anson Hook (U. Maryland) as part of IFT-Madrid Webinars\n\ n\nAbstract\nWe show that photons moving around an axion string coupled to photons undergo an Aharonov-Bohm effect. As a result\, axion strings pro duce a distinct quantized polarization rotation of CMB photons which can b e as large as O(1%). As the CMB passes many strings\, this polarization r otation converts E-modes to B-modes and adds up like a random walk. We sh ow that the expected size of the final result is well within the reach of current and future CMB experiments. The quantized polarization rotation a ngle is topological in nature and its value provides insight into the quan tization of electric charge.\n LOCATION:https://researchseminars.org/talk/IFTWeb/13/ END:VEVENT BEGIN:VEVENT SUMMARY:Yotam Soreq (Technion) DTSTART:20201105T150000Z DTEND:20201105T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/14 DESCRIPTION:Title: Probing new physics at the precision frontier\nby Yotam Soreq (Technio n) as part of IFT-Madrid Webinars\n\n\nAbstract\nIn this talk we discuss d ifferent methods to probe new light physics at the precision frontier. Iso tope shifts are measurements of atomic spectral lines (electronic transiti ons) in different isotopes. We discuss the sensitivity of these measuremen ts to probe new long range forces by using King and generalized King analy ses in the light of the new experimental results. \nFinally\, we discuss t he possibility to prove axion-like-particles by superconducting radio-freq uency cavities.\n LOCATION:https://researchseminars.org/talk/IFTWeb/14/ END:VEVENT BEGIN:VEVENT SUMMARY:Pierre Auclair (U. Paris\, CNRS) DTSTART:20201112T150000Z DTEND:20201112T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/15 DESCRIPTION:Title: Primordial black holes from metric preheating: mass fraction in the excurs ion-set approach\nby Pierre Auclair (U. Paris\, CNRS) as part of IFT-M adrid Webinars\n\n\nAbstract\nAfter inflation\, the oscillations of the in flaton at the bottom of its potential source a parametric instability in t he equation of motion of scalar perturbations. In a recent paper by Martin et al. 2020\, it was shown that the production of ultra-light PBHs from t his instability is so efficient that they can quickly come to dominate the universe content. However their abundance is usually computed by assuming that they are rare objects that are formed at around a single scale\, and the probability that a given region of the universe ends up in a black ho le can be inferred from the knowledge of the primordial curvature power sp ectrum at that scale. Such an approach may however fail in cases where PBH s are abundantly produced\, and/or if they arise over a wide range of mass es.\n\nIn the present seminar\, I will first briefly describe the mechanis m of metric preheating and the production of PBHs that is associated to it . Then I will give a short introduction on the calculation of the mass fra ction and more particularly the excursion set formalism. This framework tr anslates the estimation of a mass fraction to the study of a Langevin equa tion\; more particularly to the first crossing distribution of a Langevin trajectory with a moving barrier. Finally\, I will present the result of a pplying this formalism to the calculation of the mass fraction of PBHs ari sing from metric preheating.\n LOCATION:https://researchseminars.org/talk/IFTWeb/15/ END:VEVENT BEGIN:VEVENT SUMMARY:Pier Paolo Giardino (IGFAE Santiago de Compostela) DTSTART:20201116T150000Z DTEND:20201116T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/16 DESCRIPTION:Title: EFT at the LHC and future colliders\nby Pier Paolo Giardino (IGFAE San tiago de Compostela) as part of IFT-Madrid Webinars\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/IFTWeb/16/ END:VEVENT BEGIN:VEVENT SUMMARY:Rajamani Narayanan (Florida Int. U.) DTSTART:20201123T150000Z DTEND:20201123T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/17 DESCRIPTION:Title: A three-dimensional conformal field theory inspired by QED\nby Rajaman i Narayanan (Florida Int. U.) as part of IFT-Madrid Webinars\n\n\nAbstract \nLattice studies have convincingly shown that parity invariant QED in thr ee dimensions is scale invariant for all values of number of flavors. This implies that the measure for the gauge field is conformal after the fermi ons have been integrated out. Assuming a quadratic action for the gauge fi elds that is conformal\, it is possible to compute fermionic correlation f unctions on the lattice. The results so obtained match that of QED for all values of flavors of interest. This numerical analysis is an example of a study of an interacting conformal field theory on the lattice without the need for fine tuning.\n LOCATION:https://researchseminars.org/talk/IFTWeb/17/ END:VEVENT BEGIN:VEVENT SUMMARY:Anne Nielsen (MPI Dresden) DTSTART:20201119T150000Z DTEND:20201119T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/18 DESCRIPTION:Title: Special states in quantum many-body spectra\nby Anne Nielsen (MPI Dres den) as part of IFT-Madrid Webinars\n\n\nAbstract\nWhile quantum many-body systems typically thermalize\, exceptions to thermalization provide inter esting opportunities\, e.g. with respect to information storage. One possi bility is that all states in the spectrum many-body localize. Another is a weak violation of thermalization\, in which a few special states in the s pectrum do not thermalize\, while the rest do. This phenomenon is known as quantum many-body scars.\n\nHere\, we propose and demonstrate that one ca n similarly have a weak violation of many-body localization\, in which one or a few states in a spectrum have above area law entanglement\, while th e rest of the states are many-body localized. We show that this can be ach ieved through a mechanism\, in which emergent symmetry of the special stat es prevents many-body localization in these states. In addition\, we provi de two examples of normal quantum many-body scars\, in which the special s tates are topological.\n\nReferences: arXiv:2002.07824\, arXiv:2009.03923\ , arXiv:2009.00022\n LOCATION:https://researchseminars.org/talk/IFTWeb/18/ END:VEVENT BEGIN:VEVENT SUMMARY:Daniel Robaina (MPI Garching) DTSTART:20201126T150000Z DTEND:20201126T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/20 DESCRIPTION:Title: Studying 2D Lattice Gauge Theories with Tensor Networks\nby Daniel Rob aina (MPI Garching) as part of IFT-Madrid Webinars\n\n\nAbstract\nFor year s Tensor Networks have been exploited to study many-body-physics problems mostly in the field of Condensed Matter Physics. Its application to Lattic e Gauge Theories is a much newer field. I will review the motivation behin d using Tensor Networks for Lattice Gauge Theories and introduce the state -of-the-art problems that are being tackled. The remainder of the talk wil l consist in showing how a particular type of Tensor Network called Infini te Projected Entangled Pair States (iPEPS) can be used to simulate a 2+1d Z_3 lattice gauge theory. This represents a crucial step towards attemptin g simulations of more challenging gauge groups and higher dimensions.\n LOCATION:https://researchseminars.org/talk/IFTWeb/20/ END:VEVENT BEGIN:VEVENT SUMMARY:W.G. Hollik (KIT Karlsruhe) DTSTART:20201203T150000Z DTEND:20201203T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/21 DESCRIPTION:Title: Charting the Vacuum Landscape in SUSY benchmark scenarios\nby W.G. Hol lik (KIT Karlsruhe) as part of IFT-Madrid Webinars\n\n\nAbstract\nWe revie w vacuum stability criteria in supersymmetric models and\ndescribe a fast and efficient method to study these constraints. Explicitly\nin the MSSM\, we arrive from general considerations to a dedicated analysis\nof the vac uum stability landscape in phenomenologically favoured benchmark\nscenario s. Such a study allows to search for stable configurations in the\nextende d benchmark plane and classify the allowed regions from a vacuum\nlifetime perspective.\n LOCATION:https://researchseminars.org/talk/IFTWeb/21/ END:VEVENT BEGIN:VEVENT SUMMARY:V. Martin-Lozano (DESY) DTSTART:20201210T150000Z DTEND:20201210T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/22 DESCRIPTION:Title: Scalar taus at the LHC: How we will find them\nby V. Martin-Lozano (DE SY) as part of IFT-Madrid Webinars\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/IFTWeb/22/ END:VEVENT BEGIN:VEVENT SUMMARY:Francesco Montanari (IFT Madrid) DTSTART:20201214T150000Z DTEND:20201214T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/23 DESCRIPTION:Title: Dark matter constraints with Milky Way stellar dynamics\nby Francesco Montanari (IFT Madrid) as part of IFT-Madrid Webinars\n\n\nAbstract\nI wil l show novel methods to constrain dark matter properties based on Milky Wa y stellar dynamics. First\, I will discuss a Bayesian framework to search for correlations among Milky Way stellar trajectories and those of globula r clusters and dwarf galaxies in the halo and in other nearby galaxies. Sc attering events with compact objects are expected in the primordial black hole cold dark matter scenario\, due to close encounters between stars and primordial black holes in the dense environments of dwarf spheroidals. Se cond\, I will discuss how to optimally use the density profile of Milky Wa y stellar streams as a proxy to dark matter properties.\n LOCATION:https://researchseminars.org/talk/IFTWeb/23/ END:VEVENT BEGIN:VEVENT SUMMARY:Viviana Gammaldi (IFT) DTSTART:20201221T150000Z DTEND:20201221T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/24 DESCRIPTION:Title: Indirect detection of (Multi-TeV) dark matter: recent results and new goal s\nby Viviana Gammaldi (IFT) as part of IFT-Madrid Webinars\n\n\nAbstr act\nIn the era of TeV observatories\, Multi-TeV Weak Interactive Massive Particles (WIMPs) are interesting dark matter candidate\, among others. I will present an overview on this topic\, including some recent results and new research prospects. In particular\, I will show that a black-hole-ind uced DM-spike of Multi-TeV WIMPs well fits the Galactic Center cut-off det ected by HESS in the gamma rays. Nonetheless\, we can set further constrai nts on the WIMP DM mass and annihilation cross section via the study of bo th multi-messenger and multi-wavelength signals from several astrophysical targets\, e.g. recently proposed dwarf irregular galaxies. Finally\, I wi ll briefly introduce the branons as extra-dimensional Multi-TeV dark matte r candidates.\n LOCATION:https://researchseminars.org/talk/IFTWeb/24/ END:VEVENT BEGIN:VEVENT SUMMARY:Javier Molina Vilaplana (U. Cartagena) DTSTART:20210111T150000Z DTEND:20210111T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/25 DESCRIPTION:Title: Entanglement\, Holography and Tensor Networks\nby Javier Molina Vilapl ana (U. Cartagena) as part of IFT-Madrid Webinars\n\n\nAbstract\nIn recent years\, it has been proposed that the space-time fabric could emerge from the entanglement patterns within the degrees of freedom of a dual quantum many body theory.\n\nThese ideas have a natural arena to play with in the field of tensor networks. There are many different types of tensor networ ks\, but those on which much interest has been raised is MERA (multi-scale entanglement renormalization ansatz). Namely\, it has been noted that the entanglement patterns within a quantum state given by a MERA tensor netwo rk\, resemble the structure of entanglement in AdS/CFT evinced by the Ryu- Takayanagi formula. This has led to the proposal that MERA could be realiz ation of this duality. Motivated\, by this\, a (non)perturbative MERA form alism\, able to deal with continuous interacting theories\, seems to be es sential to advance in this program.\n\nHere\, we will briefly introduce a MERA formalism for interacting quantum field theories (icMERA). Our result s show that icMERA wavefunctionals encode proper non-Gaussian correlations of an interacting theory\, thus providing a new variational tool to study the connection between tensor networks and holography.\n LOCATION:https://researchseminars.org/talk/IFTWeb/25/ END:VEVENT BEGIN:VEVENT SUMMARY:Alvaro Martin Alhambra (MPI-Quantenoptick. Garching) DTSTART:20210114T150000Z DTEND:20210114T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/26 DESCRIPTION:Title: Quantum thermal states on the lattice: correlations\, area laws and tensor network representations\nby Alvaro Martin Alhambra (MPI-Quantenoptick . Garching) as part of IFT-Madrid Webinars\n\n\nAbstract\nIn the past coup le of decades\, one of the biggest triumphs of quantum information theory has been the characterization of correlations of ground states of quantum many-body systems. This usually takes the form of area laws for the entang lement entropy\, which can be rigorously linked to the efficient classical simulability of ground states. A similar intuition applies to thermal sta tes\, which are known to obey an area law for the quantum mutual informati on. Here\, we will present the tightest area laws known for quantum therma l states on lattices\, with an improved dependence on the temperature. The se involve the mutual information\, as well as other information-theoretic measures of correlations\, such as the entanglement of purification. Whil e the direct connection between thermal area laws and simulability is stil l unknown\, we show how the same techniques that lead to improved area law s also lead to provably efficient tensor network algorithms for thermal st ates. In doing so\, we provide the first rigorous quasilinear-time algorit hm for one-dimensional models\, which closely matches what is found in heu ristic numerical approaches.\n LOCATION:https://researchseminars.org/talk/IFTWeb/26/ END:VEVENT BEGIN:VEVENT SUMMARY:Luca Santoni (U. Columbia) DTSTART:20210121T150000Z DTEND:20210121T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/27 DESCRIPTION:Title: Symmetries of black hole perturbations\nby Luca Santoni (U. Columbia) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe direct detection of grav itational waves has marked the dawn of the era of gravitational-wave astro nomy. With an ever increasing number of observed black hole mergers and wi th the possibility of precise measurements achievable with third-generatio n and space-based detectors\, gravitational-wave astronomy is providing us with a unique opportunity to test general relativity in the strong-field regime. In order to understand how gravity works at the fundamental level and explain some still unsolved mysteries about black holes and compact ob jects\, symmetries play a special role. Symmetries allow\, e.g.\, to make robust and model-independent predictions for the observables\, and constra in broad classes of theories beyond general relativity. \nAfter a short re view of black hole perturbation theory\, I will discuss properties of pert urbations around Schwarzschild black holes. I will discuss\, in particular \, the implications of symmetries at the level of the observables. These i nclude the quasi-normal mode spectrum and the static response of black hol es\, a.k.a. the Love numbers. If time permits\, I will introduce an effect ive field theory for perturbations around “hairy” black holes and disc uss how gravitational-wave observations could be used to constrain the cou plings of the operators in the theory.\n LOCATION:https://researchseminars.org/talk/IFTWeb/27/ END:VEVENT BEGIN:VEVENT SUMMARY:Yonit Hochberg (Hebrew U. Jerusalem) DTSTART:20210118T150000Z DTEND:20210118T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/28 DESCRIPTION:Title: New Directions for Light Dark Matter\nby Yonit Hochberg (Hebrew U. Jer usalem) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe exploration of d ark matter beyond the WIMP is of vital importance\ntowards resolving the i dentity of dark matter. In this talk\, I will\nfocus on light dark matter. From the theory side\, I will discuss new\ntheoretical developments that suggest light dark matter. From the\nexperimental side\, I will present ne w proposals for the direct\ndetection of light dark matter which hold much promise. These include\nthe use of superconducting nanowires\, two-dimens ional targets such as\ngraphene\, and Dirac materials. Considering dark ma tter interactions\nwith these targets\, I will demonstrate the potential o f the light dark\nmatter direct detection program in upcoming years.\n LOCATION:https://researchseminars.org/talk/IFTWeb/28/ END:VEVENT BEGIN:VEVENT SUMMARY:Anna Tokareva (Jyvaskyla U. and Moscow\, INR) DTSTART:20210128T150000Z DTEND:20210128T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/29 DESCRIPTION:Title: Massless Positivity\nby Anna Tokareva (Jyvaskyla U. and Moscow\, INR) as part of IFT-Madrid Webinars\n\n\nAbstract\nWe formulate Positivity Boun ds for scattering amplitudes including exchange of massless particles. We generalize the standard construction through dispersion relations to inclu de the presence of a branch cut along the real axis in the complex plane f or the Maldestam variable s. In general\, validity of these bounds require the cancellation of divergences in the forward limit of the amplitude\, p roportional to 1/t and log(t). We show that this is possible in the case o f gravitons if one assumes a Regge behavior of the amplitude at high energ ies below the Planck scale. The bounds that we present have the potential of constraining very general models of modified gravity and EFTs of matter coupled to gravitation.\n LOCATION:https://researchseminars.org/talk/IFTWeb/29/ END:VEVENT BEGIN:VEVENT SUMMARY:Marija Tomasevic (U. Barcelona) DTSTART:20210204T150000Z DTEND:20210204T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/30 DESCRIPTION:Title: Aspects of Traversable Wormholes\nby Marija Tomasevic (U. Barcelona) a s part of IFT-Madrid Webinars\n\n\nAbstract\nI will review some basic feat ures of traversable wormholes and discuss the progress made in the past co uple of years.\n LOCATION:https://researchseminars.org/talk/IFTWeb/30/ END:VEVENT BEGIN:VEVENT SUMMARY:Pedro Ferreira (ISEL and CFTC-UL\, Lisbon\, Portugal) DTSTART:20210201T150000Z DTEND:20210201T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/31 DESCRIPTION:Title: Multiscalar models - theoretical puzzles and LHC searches\nby Pedro Fe rreira (ISEL and CFTC-UL\, Lisbon\, Portugal) as part of IFT-Madrid Webina rs\n\n\nAbstract\nThe Standard model contains a single elementary scalar p article\, the Higgs boson\, discovered at the LHC in 2012. The Model is re markably successful\, but it leaves a great deal of unanswered questions. There have been many attempts to addressed some of those open issues\, by enlarging the scalar sector\, thus predicting a richer spectrum of spin-0 elementary particles. This allows one to create models where one may: have Dark Matter candidates complying with all current experiemental constrain ts\; predict spontaneous (or explicit) CP violation arising from the scala r sector\; or explain eventual excesses in LHC search channels.\n\nA large r scalar spectrum\, however\, raises problems of its own: the size of the parameter space increases\, with potentially a large number of parameters with unknown values and ranges reducing the model's predictivity. The vacu um state of the theory is no longer guaranteed\, in many multiscalar model s\, to lead to the correct electroweak symmetry breaking. Tree-level flavo ur changing neutral currents (FCNC) mediated by neutral scalars are on man y occasions possible\, the magnitude of those couplings heavily restricted by existing experimental data.\n\nIn this seminar I'll review the basic c onstraints one needs to ask of multiscalar models to be certain it is a vi able model\; and the "tools of the trade" to help when one is creating a m odel with specific purposes. I'll also show several recent results discus sing vacuum stability in several multiscalar models\; a simple solution to the strong-CP problem\; constraints on multiscalar parameter space from d ark matter searches\; and exotic sources of CP violation.\n LOCATION:https://researchseminars.org/talk/IFTWeb/31/ END:VEVENT BEGIN:VEVENT SUMMARY:Kalliopi Petraki (Paris LPTHE and Nikhef\, Amsterdam) DTSTART:20210211T150000Z DTEND:20210211T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/32 DESCRIPTION:Title: Dark matter goes nuclear: overhauling thermal decoupling at the TeV scale with bound states\nby Kalliopi Petraki (Paris LPTHE and Nikhef\, Amste rdam) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe production of dark matter via thermal decoupling from the primordial plasma\, and the direct \, indirect and collider signals associated with this mechanism\, have bee n the pillars of dark matter phenomenology in the past decades. In sharp c ontrast to the sub-TeV regime\, the interactions of thermal-relic dark mat ter with multi-TeV or larger mass manifest as long-range. This is supporte d by unitarity arguments\, and shown by explicit calculations in WIMP and other models. The long-range nature of the interactions gives rise to non- perturbative effects\, with the most prominent being the existence of boun d states. The formation and decay of unstable bound states in the early un iverse decrease the dark matter density\, thereby changing its predicted m ass and/or couplings. This can have severe implications for all experiment al probes\, particularly for collider and indirect searches.\n LOCATION:https://researchseminars.org/talk/IFTWeb/32/ END:VEVENT BEGIN:VEVENT SUMMARY:Matteo Fasiello (IFT Madrid) DTSTART:20210208T150000Z DTEND:20210208T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/33 DESCRIPTION:Title: Probing Inflation with Primordial Messengers\nby Matteo Fasiello (IFT Madrid) as part of IFT-Madrid Webinars\n\n\nAbstract\nSome of our best ide as on early universe physics are about to be put to the test by an unprece dented array of cosmological probes. The data these will collect span a va st range of scales\, from the CMB to large scale structure\, from pulsar t iming arrays all the way to laser interferometers. This combined wealth of new information holds the potential to transform our understanding of cos mology and\, possibly\, also particle physics. In this context probing the earliest accessible epoch\, inflation\, is crucial: inflation can provide a cosmological portal to otherwise inaccessible energy scales. This is th e “cosmological collider” idea. The spectacular success of the inflati onary paradigm in explaining the origin of cosmic structure demands that w e tackle a number of compelling questions still in need of an answer: wha t is the energy scale of inflation? What fields were active during inflat ion?\n\nIn this talk I will review recent progress on the inflationary fie ld content. I will survey different approaches to address the most pressin g challenges and provide examples including axion-inflation models and the so-called effective theory approach. I will then focus on the key observa bles\, starting with primordial gravitational waves\, and discuss their pr ospects for detection.\n LOCATION:https://researchseminars.org/talk/IFTWeb/33/ END:VEVENT BEGIN:VEVENT SUMMARY:Kalliopi Petraki (Paris LPTHE and Nikhef\, Amsterdam) DTSTART:20210215T150000Z DTEND:20210215T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/34 DESCRIPTION:Title: Dark matter goes nuclear: overhauling thermal decoupling at the TeV scale with bound states\nby Kalliopi Petraki (Paris LPTHE and Nikhef\, Amste rdam) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe production of dark matter via thermal decoupling from the primordial plasma\, and the direct \, indirect and collider signals associated with this mechanism\, have bee n the pillars of dark matter phenomenology in the past decades. In sharp c ontrast to the sub-TeV regime\, the interactions of thermal-relic dark mat ter with multi-TeV or larger mass manifest as long-range. This is supporte d by unitarity arguments\, and shown by explicit calculations in WIMP and other models. The long-range nature of the interactions gives rise to non- perturbative effects\, with the most prominent being the existence of boun d states. The formation and decay of unstable bound states in the early un iverse decrease the dark matter density\, thereby changing its predicted m ass and/or couplings. This can have severe implications for all experiment al probes\, particularly for collider and indirect searches.\n LOCATION:https://researchseminars.org/talk/IFTWeb/34/ END:VEVENT BEGIN:VEVENT SUMMARY:Giulia Zanderighi (MPI Munich) DTSTART:20210218T150000Z DTEND:20210218T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/35 DESCRIPTION:Title: Precision Physics at the LHC: why and how\nby Giulia Zanderighi (MPI M unich) as part of IFT-Madrid Webinars\n\n\nAbstract\nMeasurements at the L HC have already reached a remarkable precision. This\nopens up new opportu nities for New Physics searches. However\, the accuracy\nof experimental d ata must be matched by the theoretical one. In this talk\, I\nwill discuss recent progress in precision QCD predictions.\n LOCATION:https://researchseminars.org/talk/IFTWeb/35/ END:VEVENT BEGIN:VEVENT SUMMARY:David Cerdeno (IFT Madrid) DTSTART:20210301T150000Z DTEND:20210301T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/36 DESCRIPTION:Title: Direct detection window to light new physics\nby David Cerdeno (IFT Ma drid) as part of IFT-Madrid Webinars\n\n\nAbstract\nIn order to search for dark matter with increased sensitivity\, the new\ngeneration of direct de tection experiments will soon be operational with an\nincreased target siz e (e.g. LZ with approximately 5 tons of LXe) and lower\nexperimental thres holds (e.g. SuperCDMS in the high-voltage operation mode).\nWhile these fe atures will certainly help further narrowing down the\nparameter space of weakly-interacting massive particles\, they also offer the\npossibility of probing less canonical candidates for dark matter\, as well as\nother typ es of new physics in the neutrino sector. In this talk I will\nreview the different possibilities that this offers\, including a recent\nexample fro m 2006.11225\, in which a light mediator in a gauged\nU(1)(L\\mu-L\\tau) c ould explain the discrepancy in the muon anomalous\nmagnetic moment.\n LOCATION:https://researchseminars.org/talk/IFTWeb/36/ END:VEVENT BEGIN:VEVENT SUMMARY:Cyril Pitrou (Institut d'Astrophysique de Paris) DTSTART:20210308T150000Z DTEND:20210308T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/37 DESCRIPTION:Title: Precision big bang nucleosynthesis and the status of deuterium\nby Cyr il Pitrou (Institut d'Astrophysique de Paris) as part of IFT-Madrid Webina rs\n\n\nAbstract\nPrimordial nucleosynthesis or Big-Bang Nucleosynthesis ( BBN) happens during the first 300 seconds of our Universe. It is one of th e three evidences for the big-bang model\, together with the cosmological expansion and the Cosmic Microwave Background (CMB). Now that the number o f neutrino families and the baryonic densities have been fixed by laborato ry measurements or CMB observations\, it has become a parameter free model . Since the most recent measurements of primordial deuterium and Helium-4 abundances reach the percent level in precision\, it is necessary to obtai n a similar precision in theoretical predictions. I will review the basic physics of primordial cosmology and BBN and then review the various effect s which need to be taken into account at that epoch in order to obtain suc h precision. I will also discuss a tension in primordial deuterium which h as emerged following a recent update on one of the key nuclear rates.\n LOCATION:https://researchseminars.org/talk/IFTWeb/37/ END:VEVENT BEGIN:VEVENT SUMMARY:J.A. Aguilar Saavedra (U. Granada and IFT Madrid) DTSTART:20210322T150000Z DTEND:20210322T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/39 DESCRIPTION:Title: Top-pourri: from current anomalies to future colliders including machine l earning\nby J.A. Aguilar Saavedra (U. Granada and IFT Madrid) as part of IFT-Madrid Webinars\n\n\nAbstract\nAs an appetizer\, I will point out t he current mismatch between\nprecise SM predictions and experimental measu rements in top quark\nproduction. I will discuss how future colliders may test the top quark at\nthe highest energies\, searching for evidence of ne w forces in Nature\, or\nsubstructure of this particle\, hitherto consider ed pointlike and elementary.\nI will present an example of how machine lea rning can be of great help in\nthis endeavour.\n LOCATION:https://researchseminars.org/talk/IFTWeb/39/ END:VEVENT BEGIN:VEVENT SUMMARY:Marina Cermeño (U. Louvain) DTSTART:20210318T150000Z DTEND:20210318T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/40 DESCRIPTION:Title: Circular polarisation of gamma rays as a probe of DM-cosmic ray electron i nteractions\nby Marina Cermeño (U. Louvain) as part of IFT-Madrid Web inars\n\n\nAbstract\nDark Matter (DM) constitutes most of the matter in th e presently accepted\ncosmological model for our Universe. However\, despi te the increased\nsensitivity of direct and indirect DM searches\, and the latest LHC run at 13\nTeV centre of mass energy\, no signal from DM parti cles has been detected so\nfar\, leading to exclusion limits on the parame ter space of DM models.\nConventional indirect searches look for an excess in the electromagnetic\nemission from the sky that cannot be attributed t o known astrophysical\nsources\, but polarisation is so far not being expl ored.\n\nIn this talk\, I will argue that the photon polarisation is an im portant\nfeature to understand new physics interactions. In particular\, c ircular\npolarisation can be generated from Beyond the Standard Model (BSM )\ninteractions if they violate parity and there is an asymmetry in the nu mber\nof particles which participate in the interaction. I will consider a \nsimplified model for fermionic (Majorana) DM and study the circularly\np olarised gamma rays below 10 GeV from DM cosmic ray electron interactions. \nI will study the differential flux of positive and negative polarised\np hotons from the Galactic Centre and show that the degree of circular\npola rization can reach up to 90%. Finally\, I will discuss the detection\npros pects of this signal in future experiments.\n LOCATION:https://researchseminars.org/talk/IFTWeb/40/ END:VEVENT BEGIN:VEVENT SUMMARY:Andres Perez (IFLP-Buenos Aires) DTSTART:20210325T150000Z DTEND:20210325T160000Z DTSTAMP:20260422T212558Z UID:IFTWeb/41 DESCRIPTION:Title: Hunting Dark Matter Signals at the LHC with neural networks\nby Andres Perez (IFLP-Buenos Aires) as part of IFT-Madrid Webinars\n\n\nAbstract\nW e study several simplified dark matter models and their signatures at the\ nLHC using Neural Networks. We focus on the usual monojet plus missing\ntr ansverse energy channel\, but to train the algorithms we organize the data \nin 2D histograms instead of event-by-event arrays. This results in a hug e\nperformance boost to distinguish between SM only and SM plus new physic s\nsignals. We found that Neural Network results do not change with lumino sity\,\nif they are shown as a function of S/Sqrt[B]\, where S and B are t he number of\nsignal and background events per histogram\, respectively. T o keep a broader\napproach\, we do not specify the simplified models coupl ing values. This\nprovides flexibility to the method\, since testing a par ticular model is\nstraightforward\, only the new physics monojet cross-sec tion is needed.\nFurthermore\, we discuss the performance of the networks under wrong\nassumptions. Finally\, we propose multimodel classifiers to s earch and\nidentify new signals in a model independent way\, for the next LHC run.\n LOCATION:https://researchseminars.org/talk/IFTWeb/41/ END:VEVENT BEGIN:VEVENT SUMMARY:Valeria Pettorino (CEA Saclay) DTSTART:20210329T140000Z DTEND:20210329T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/42 DESCRIPTION:Title: Dark Energy\, from theory to data\nby Valeria Pettorino (CEA Saclay) a s part of IFT-Madrid Webinars\n\n\nAbstract\nCosmology is advancing thanks to contributions from theory\, data\, and methods that link them. I will discuss recent results I have been working on\, which touch these three as pects. I will in particular discuss: a) coupled dark energy and the H0 ten sion\; b) weak lensing statistics as a tool to distinguish different theor etical models\; c) forecasts for the Euclid satellite space mission\, whos e launch is expected in 2022.\n LOCATION:https://researchseminars.org/talk/IFTWeb/42/ END:VEVENT BEGIN:VEVENT SUMMARY:Andreas Mantziris (Imperial College) DTSTART:20210408T140000Z DTEND:20210408T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/43 DESCRIPTION:Title: Cosmological implications of electroweak vacuum instability: constraints o n the Higgs curvature coupling from inflation\nby Andreas Mantziris (I mperial College) as part of IFT-Madrid Webinars\n\n\nAbstract\nThe current experimentally measured parameters of the Standard Model (SM) suggest tha t our universe lies in a metastable electroweak vacuum\, where the Higgs f ield could decay to a lower vacuum state with catastrophic consequences. O ur measurements dictate that such an event has not happened yet\, despite the many different mechanisms that could have triggered it during our past light-cone. Via this observation\, we can establish a promising link betw een cosmology and particle physics and thus constrain important parameters of our theories. The focus of our work has been to explore this possibili ty by calculating the probability of the false vacuum to decay during the period of inflation and using it to constrain the last unknown renormalisa ble SM parameter $\\xi$\, which couples the Higgs field with space-time cu rvature. In our latest study\, we derived lower bounds for the Higgs-curva ture coupling from vacuum stability in three inflationary models: quadrati c and quartic chaotic inflation\, and Starobinsky-like power-law inflation . In contrast to most previous studies we took the time-dependence of the Hubble rate into account both in the geometry of our past light-cone and i n the Higgs effective potential\, which is approximated with three-loop re normalisation group improvement supplemented with one-loop curvature corre ctions. We find that in all three models\, the lower bound is $\\xi \\gtrs im 0.051 ... 0.066$ depending on the top quark mass. We also demonstrated that vacuum decay is most likely to happen a few e-foldings before the end of inflation.\n LOCATION:https://researchseminars.org/talk/IFTWeb/43/ END:VEVENT BEGIN:VEVENT SUMMARY:Theodoros Papanikolaou (APC\, Paris) DTSTART:20210415T140000Z DTEND:20210415T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/44 DESCRIPTION:Title: Constraining the early universe with ultralight primordial black holes and vice-versa\nby Theodoros Papanikolaou (APC\, Paris) as part of IFT-Ma drid Webinars\n\n\nAbstract\nIn our presentation\, we focus on ultralight PBHs\, not tightly constrained in the literature\, produced naturally duri ng the preheating instability in the context of single-field inflationary models. In particular\, we find that the PBH production mechanism can be s o efficient that PBHs subsequently dominate the content of the universe an d reheating proceeds from their evaporation. Taking into account observati onal constraints on the PBH abundance one can constrain the energy scales at the end of inflation and at the onset of the radiation era. Vice-versa\ , by studying induced second order gravitational waves generated by densit y perturbations underlain by PBHs themselves and taking into account GW ba ck-reaction effects one can set constraints on the initial abundance of PB Hs as a function \nof their mass.\n LOCATION:https://researchseminars.org/talk/IFTWeb/44/ END:VEVENT BEGIN:VEVENT SUMMARY:Carlos Arguelles (UNLP\, La Plata) DTSTART:20210422T140000Z DTEND:20210422T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/45 DESCRIPTION:Title: Fermionic Dark Matter Profiles\nby Carlos Arguelles (UNLP\, La Plata) as part of IFT-Madrid Webinars\n\n\nAbstract\nWe discuss the problem of da rk matter halos\, by assuming a quantum fermionic\nparticle as the buildin g block for the DM component\, each of which\nself-gravitates in a quasi-v irialized system of collisionless fermions. We\nshow that DM fermions acco unting for the Pauli-principle and particle escape\neffects in the coarse- grained phase-space distribution at relaxation\, can\nlead to a more gener al density profile which developes a degenerate-core\nsurrounded by a dilu ted-halo able to reproduce the galaxy rotation curves.\nInterestingly\, su ch\nvery dense nucleus of dark matter at the center of the DM halo\, can m imic\nthe effects of a central black hole\, or eventually collapse to form one. In\nthe case of our Galaxy\, we show that the dense DM core can prod uce similar\ngravitational effects than the putative massive BH centered i n SgrA*\, for\nparticle masses m ~ 10 -100 keV. The formation mechanism\, stability\, and\nother astrophysical and cosmological consequences of such novel fermionic\nprofiles will be discussed as well.\n LOCATION:https://researchseminars.org/talk/IFTWeb/45/ END:VEVENT BEGIN:VEVENT SUMMARY:Carmelita Carbone (INAF-IASF Milano) DTSTART:20210419T140000Z DTEND:20210419T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/46 DESCRIPTION:Title: The imprint of dark energy and neutrinos on cosmic voids\nby Carmelita Carbone (INAF-IASF Milano) as part of IFT-Madrid Webinars\n\n\nAbstract\n After a brief introduction\, I will show how the largest structures in the Universe\, the so-called cosmic voids\, are probes sensitive to the prese nce of dynamic dark energy and massive neutrinos. The results presented in this talk have been obtained from the analysis of the "Dark Energy and Ma ssive Neutrino Universe" simulations\, a set of 16 large N-body simulation s conceived to study the combination of different probes in the presence o f dark energy (with CPL parametrisation) and massive neutrinos. This analy sis highlights how different statistics\, such as the void size function\, the void auto-correlation\, and void-CMB cross-correlations can be able t o disentangle the impact of dark energy and massive neutrinos\, and help t o improve the performance of future galaxy surveys in unveiling their natu re.\n LOCATION:https://researchseminars.org/talk/IFTWeb/46/ END:VEVENT BEGIN:VEVENT SUMMARY:Luciano Maiani (Roma La Sapienza) DTSTART:20210426T140000Z DTEND:20210426T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/47 DESCRIPTION:Title: The new exotics Zcs(3085)\, Zcs(4003)\, Y(4230) decays and Flavour SU(3)\nby Luciano Maiani (Roma La Sapienza) as part of IFT-Madrid Webinars\n\ n\nAbstract\nNew data from BES III and LHCb indicate the existence of two hidden charm\, open strangeness resonances\, Zcs(3985) and Zcs(4003). The near degeneracy of Zcs(3985) and Zcs(4003) reproduces\, in the strange sec tor\, the situation observed with X(3872) and Zc(3900). We show that\, in the tetraquark picture\, the Zcs resonances\, together with X(3872)\, X(41 40) and Zc(3900)\, neatly fit into two nonets of flavour SU(3)\, with JP = 1+ and opposite charge-conjugation. The mass of the missing element of t he nonets is predicted. \nIn the same framework\, we have made a study of the decays of Y(4230) observed by BES III in e+e- annihilation. Results ar e compared with the well studied decays D∗ → D π decays\, obtaining c onsistent results for the quark-pion coupling. We extend the discussion to the decay B -> K phi J/Psi where the signal of Zcs(4003) has been observe d by LHCb.\n These results represent a significative score in favour of t he tetraquark model. We discuss briefly further steps necessary to clarify the nature of the exotic states under study.\n LOCATION:https://researchseminars.org/talk/IFTWeb/47/ END:VEVENT BEGIN:VEVENT SUMMARY:Gilberto Colangelo (University of Bern) DTSTART:20210510T140000Z DTEND:20210510T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/48 DESCRIPTION:Title: The muon g-2 in the standard model: a review of the calculation of hadroni c contributions\nby Gilberto Colangelo (University of Bern) as part of IFT-Madrid Webinars\n\n\nAbstract\nIn this talk I will review the status of the standard model calculation of the muon g-2. After a brief discussio n of the QED and EW contributions I will concentrate on the hadronic ones\ , which are responsible for most of the final theoretical uncertainties. I will start with the hadronic vacuum polarization (HVP) first as calculate d with a dispersive\, data-driven approach\, and then on the lattice\, con centrating in particular on the result by the BMW collaboration. I will th en discuss the hadronic light-by-light (HLbL) contribution\, which has rec ently also become amenable to a dispersive\, data-driven approach. Also th is contribution can be calculated on the lattice and recently two collabor ations have presented their results\, which I will also briefly discuss. I will conclude with an outlook on possible future improvements in the calc ulation of these hadronic contributions.\n LOCATION:https://researchseminars.org/talk/IFTWeb/48/ END:VEVENT BEGIN:VEVENT SUMMARY:Xavier Marcano (Orsay\, LPT) DTSTART:20210513T140000Z DTEND:20210513T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/49 DESCRIPTION:Title: Massive sterile neutrinos in single and double beta decays\nby Xavier Marcano (Orsay\, LPT) as part of IFT-Madrid Webinars\n\n\nAbstract\nNuclea r beta and double beta decay experiments are intensively exploring the neu trino parameter space. In this talk\, we will see how these experiments co uld through light not only to the active neutrino sector\, but also to the sterile one. During the first part\, we will revisit the potential of sin gle beta decay experiment to search for keV sterile neutrinos\, highlighti ng its complementarity with neutrinoless double beta decay searches. In th e second part\, we will discuss a new method to search for sterile neutrin os in the two neutrino double beta decay process\, which could probe the M eV mass hypothesis beyond current limits.\n LOCATION:https://researchseminars.org/talk/IFTWeb/49/ END:VEVENT BEGIN:VEVENT SUMMARY:Robert Reischke (Astronomisches Institut\, Ruhr-Universität Bochu m) DTSTART:20210517T140000Z DTEND:20210517T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/50 DESCRIPTION:Title: Consistent equivalence principle tests with fast radio bursts\nby Robe rt Reischke (Astronomisches Institut\, Ruhr-Universität Bochum) as part o f IFT-Madrid Webinars\n\nAbstract: TBA\n LOCATION:https://researchseminars.org/talk/IFTWeb/50/ END:VEVENT BEGIN:VEVENT SUMMARY:Louis Perenon (U. Western Cape) DTSTART:20210520T140000Z DTEND:20210520T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/51 DESCRIPTION:Title: Multi-tasking the growth of cosmological structures\nby Louis Perenon (U. Western Cape) as part of IFT-Madrid Webinars\n\n\nAbstract\nNext-gener ation large-scale structure surveys will deliver a significant increase in the precision of growth data\, allowing us to use `agnostic' methods to s tudy the evolution of perturbations without the assumption of a cosmologic al model. We focus on a particular machine learning tool\, Gaussian proces ses\, to reconstruct the growth rate f\, the root mean square of matter fl uctuations \\sigma_8\, and their product f\\sigma_8. We apply this method to simulated data\, representing the precision of upcoming Stage IV galaxy surveys. We extend the standard single-task approach to a multi-task appr oach that reconstructs the three functions simultaneously\, thereby taking into account their inter-dependence. We find that this multi-task approac h outperforms the single-task approach for future surveys and will allow u s to detect departures from the standard model with higher significance. B y contrast\, the limited sensitivity of current data severely hinders the use of agnostic methods\, since the Gaussian processes parameters need to be fine tuned in order to obtain robust reconstructions.\n LOCATION:https://researchseminars.org/talk/IFTWeb/51/ END:VEVENT BEGIN:VEVENT SUMMARY:O. Macias Ramirez (GRAPPA. Amsterdam) DTSTART:20210527T140000Z DTEND:20210527T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/52 DESCRIPTION:Title: Searching for evidence of TeV-scale electron/positron acceleration by Mill isecond Pulsars\nby O. Macias Ramirez (GRAPPA. Amsterdam) as part of I FT-Madrid Webinars\n\n\nAbstract\nPulsars have long been predicted to be s ources of electron/positron (e-e+) pairs. Highly energetic e-e+ in the win d regions\, or inner magnetospheres of pulsars\, and also when released in to the interstellar medium\, can inverse-Compton IC) scatter ambient photo ns to very high energies. Recent HAWC observations of extended TeV-scale g amma-ray emission around Geminga and Monogem have provided indirect eviden ce for multi-TeV e-e+ acceleration in young pulsar nebulae. However\, pred icting and observing very-high-energy gamma-ray emission from rotation-pow ered millisecond pulsars (MSPs) presents a number of challenges compared t o that of the non-recycled pulsar population. During this talk\, I will su mmarize these challenges\, and present our recent exciting results where w e find evidence for very-high-energy gamma ray emission from populations o f MSPs residing in globular clusters of the Milky Way. I will further high light the unique capabilities of the Cherenkov Telescope Array to detect t he expected IC signal from a putative population of 10 to 50 thousand MSPs in the center of our Galaxy.\n LOCATION:https://researchseminars.org/talk/IFTWeb/52/ END:VEVENT BEGIN:VEVENT SUMMARY:Angeles Moline (IFT Madrid) DTSTART:20210607T140000Z DTEND:20210607T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/53 DESCRIPTION:Title: The impact of halo and subhalo properties on dark matter searches\nby Angeles Moline (IFT Madrid) as part of IFT-Madrid Webinars\n\n\nAbstract\n Cosmological observations and cold dark matter N-body simulations indicate that our Universe is populated by numerous halos\, where dark matter part icles annihilate\, potentially producing Standard Model particles. Indeed\ , one of the most active lines of research in dark matter physics is that of indirect searches of such dark matter annihilation products (gamma-rays \, neutrinos and antimatter) in different astrophysical regions. In this t alk\, I will focus on the impact of different predictions of structure for mation in such dark matter searches.\n LOCATION:https://researchseminars.org/talk/IFTWeb/53/ END:VEVENT BEGIN:VEVENT SUMMARY:Wolfgang Altmannshofer (U. C. Santa Cruz) DTSTART:20210524T140000Z DTEND:20210524T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/54 DESCRIPTION:Title: The state of B anomalies\nby Wolfgang Altmannshofer (U. C. Santa Cruz) as part of IFT-Madrid Webinars\n\n\nAbstract\nFor several years\, various experimental results on B meson decays show persistent discrepancies with respect to Standard Model expectations. Discrepancies are observed in bra nching ratios\, angular distributions\, and lepton flavor universality rat ios. I will review the status of those discrepancies\, discuss possible ne w physics explanations\, and outline the prospects of resolving them with expected experimental data.\n LOCATION:https://researchseminars.org/talk/IFTWeb/54/ END:VEVENT BEGIN:VEVENT SUMMARY:Noriyuki Sogabe (Institute of Modern Physics\, Lanzhou\, China) DTSTART:20210610T080000Z DTEND:20210610T090000Z DTSTAMP:20260422T212558Z UID:IFTWeb/55 DESCRIPTION:Title: Positive magnetoresistance induced by hydrodynamic fluctuations in chiral media\nby Noriyuki Sogabe (Institute of Modern Physics\, Lanzhou\, Chi na) as part of IFT-Madrid Webinars\n\n\nAbstract\nWe analyze the combined effects of hydrodynamic fluctuations and chiral magnetic effect (CME) for a chiral medium in the presence of a background magnetic field. Based on t he recently developed non-equilibrium effective field theory\, we show flu ctuations give rise to a CME-related positive contribution to magnetoresis tance\, while the early studies without accounting for the fluctuations fi nd a CME-related negative magnetoresistance. At zero axial relaxation rate \, the fluctuations contribute to the transverse conductivity in addition to the longitudinal one.\n LOCATION:https://researchseminars.org/talk/IFTWeb/55/ END:VEVENT BEGIN:VEVENT SUMMARY:Manuel Szewc (ICAS (Buenos Aires)) DTSTART:20210617T140000Z DTEND:20210617T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/56 DESCRIPTION:Title: Bayesian Inference for Four Tops at the LHC\nby Manuel Szewc (ICAS (Bu enos Aires)) as part of IFT-Madrid Webinars\n\n\nAbstract\nFour top produc tion is one of the last benchmarks of the SM\nexplored at the LHC\, and th us the intersection of state of the art\nexperimental techniques and theor etical calculations. In this talk\, we give\na brief review of the main pr oblems one faces when trying to disentangle\nsignal from background in suc h a complex final state. We then propose a\nrelatively simple probabilisti c mixture model where the Monte Carlo\nsimulations play the role of prior knowledge. Using a simulated dataset with\n"bad" priors and known numerica l inference techniques\, we are able to\ncorrect the initial modelling on the data to a certain degree. This in turn\nopens the door for a reduction of simulation systematics and a higher\nsensitivity to possible BSM effec ts.\n LOCATION:https://researchseminars.org/talk/IFTWeb/56/ END:VEVENT BEGIN:VEVENT SUMMARY:Tevong You (CERN) DTSTART:20210722T140000Z DTEND:20210722T150000Z DTSTAMP:20260422T212558Z UID:IFTWeb/57 DESCRIPTION:Title: Self-Organised Localization\nby Tevong You (CERN) as part of IFT-Madri d Webinars\n\n\nAbstract\nWe describe a new phenomenon in quantum cosmolog y: self-organised localisation. When the fundamental parameters of a theor y are functions of a scalar field subject to large fluctuations during inf lation\, quantum phase transitions can act as dynamical attractors. As a r esult\, the theory parameters are probabilistically localised around the c ritical value and the Universe finds itself at the edge of a phase transit ion. We illustrate how self-organised localisation could account for the o bserved near-criticality of the Higgs self-coupling\, the naturalness of t he Higgs mass\, or the smallness of the cosmological constant.\n LOCATION:https://researchseminars.org/talk/IFTWeb/57/ END:VEVENT END:VCALENDAR